نوع مقاله : پژوهشی
نویسندگان
تهران، دانشگاه صنعتی مالک اشتر، گروه مواد کامپوزیت
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Hypothesis: This study presents a comprehensive investigation into the bond behavior between glass fiber-reinforced polymer (GFRP) bars and concrete, a critical factor in ensuring structural integrity, effective stress transfer, and long-term durability of reinforced concrete structures. Given the distinct mechanical behavior of GFRP bars compared to conventional steel reinforcement, optimizing the surface rib geometry of GFRP bars is essential for enhancing their bond performance with concrete. Methods: The primary focus of this research is to analyze the influence of four key rib geometry parameters—rib height, width, spacing (pitch), and cross-sectional angle—on the bond strength of GFRP bars embedded in concrete. These parameters were systematically varied and evaluated through a combination of experimental pull-out tests and advanced numerical simulations. Experimentally, six types of machined GFRP bars with different rib geometries, including two optimized designs, were subjected to standard pull-out tests to assess their bond behavior. Numerically, 36 different rib configurations were modeled using Abaqus software. The simulations employed the Concrete Damage Plasticity (CDP) model to represent concrete behavior and the LaRC05 failure criterion to capture the response of composite materials.
Findings: The results revealed that rib height, spacing, and width significantly influence bond strength, while the cross-sectional angle has a comparatively minor effect. The optimized rib design—with a height of 0.73 mm, width of 9.44 mm, spacing of 13.84 mm, and angle of 53 degrees—achieved a maximum pull-out force of approximately 49,000 N, demonstrating a substantial improvement over conventional design. These findings underscore the importance of precise and engineered rib geometry in improving bond performance and provide a robust scientific and practical framework for the development of high-performance GFRP bars in civil engineering applications.
کلیدواژهها [English]
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